Hellfest

Hellfest (), also known as Hellfest Summer Open Air, is a rock festival focusing on heavy metal music, held annually in June in Clisson, France. Its high attendance makes it the French music festival with the largest turnover. It is also one of the biggest metal festivals in Europe and the biggest to exist in France. It has been referred to as "the most diverse extreme metal festival in the world," and is a favorite of many musicians to perform at.